Reverse mechanism.



PATENTED JULY 2, 190% A. O. FITZu REVERSE MEUHANISM. APPLICATION FILED mm: as, 1900.

I UNITED STATES PATENTGFFICE.

AMOS O. FITZ, OF PULLMAN,, ILLINOIS.

REVERSE MECHANISM.

Specification of Letters Patent.

PatentedJu1y"2,19b7.

Application filed June 22,1906- Seri No 322,828.

To all whom it may concern:

Be it known that I, AMOS O. Frrz, a citizen of the United States, residing at Pullman, inlthecounty of Cook and State of Illinois, have invented certain new the parts that the reversing lever will have a minimum throw.

I accomplish these results by the use of the mechanism illustrated in the accompanying drawing which forms a part of this specification, and in which:-

Figure 1 is a side elevation of a portion of a screw machine, showing my improved automatic. reversing mechanism attached thereto; Fig. 2 is a sectional view on the line a-abf Fig. 1; Fig. 3 is a detail sectional view, clearly showing the connection between the the same time allow the latter to be reciprocated' in the gears and spindle.

Referring to the drawing the numeral 3 indicates the bed of the machine which supports the frame 4, in which is journaled the main shaft 5 carrying a driving pulley 6, and a retaining collar' 7. A gear wheel 8 is loosely mounted upon the shaft 5 and is in mesh with a gear 9 keyed to a spindle 10 which is journaled in the fra'me 4 in such a manner as to permit it to have a longitudinal movement in its bearings. Said spindle has mounted upon one end a chuck 11 which carries the cutting die. In addition to the gear 8 the shaft 5 carries another loose gear wheel 12, which meshes with an intermediate pinion 1 3, and this in turn with a gear 14' keyed to the spindle 10 in the same manner as the gear 9. The gears 9 and 14 are operatively connected to the spindle so as to transmit rotary motion thereto by means of keys or feathers which are received in a longitudinal groove or spline cut in the said spindle. Each of said I gears is also furnished with a quill or hollow sleeve which projects through the frame 4 and is journaled therein and at the end is furnished with threads to receive a retaining collar, the faceof the'bearing opposite to the gear being counterbored to admit the said eollar so that it is flush with the surface of the frame as shown in Fig. 3. This construction'will permitof the free rotation of the gears in connection Witirthe spindleand at direction of its length while the said gears: remain longitudinally stationary. The gear 13 is secured to the frame by a stud 15. Upon theshaft 5, about midway between the gears 8 and 12 is mounted a sleeve 16 whichis secured a spline 17 extendinglongitudinally to the shaft, its length being somewhat less than the l is reciprocated on the shaft 5, by means of a forked lever,

distance between the said gears 8 and 12. The sleeve 16 having arms 18 formed integral with a bearing 19 and pivotally connected to the frame 4 by means of astnd 20. The ends of the arms 18 are provided with screw lugs 21 the ends of which .engage an annular groove 22 in the sleeve 16. The gears 8 and 12' are provided with spaced lugs 23, 24, which prdject from the opposing faces of said gears in close. proximity to the shaft upon which they are mounted. These lugs are adapted to .engage the ends of the spline 17 when the latteris'reciprocated. I

In order to render the spline more rigid collars 25 are secured to the shaft by set screws 26. These collars permit the free longitudinal movement of the spline, but prevent lateral displacement. Formed integral with the bearing 19 are two arms 27, 28; the former provided with an inclined face 27%. A vertical-lever 29 'is pivoted to a projection on the name by a shouldered screw 30. The arm 28 and the lever 29 are provided with an"- gular stops31 which are adapted to engage each other when the arm and lever are in the position shown in Fig. 1. .From the upper end of the lever 29 a pin 31" projects through a notch in the upper part of the arm 28. The said lever 29 is held in extended position, as shown in Fig.1 by a flat spring 32 secured to the frame. A spring 33 secured to the arm 28 tends to rock the conjoined arms 18, 27 and 28 against the resistance of the j angular stops 31. Upon the spindle 10 issecured an operating cam 34 in the form of a disk having a beveled face 35. Upon the same spindle is mounted a release cam 36 having a spirally inclined contact surface 36. Thecams 34 and 36 are adjustably secured to the spindle by set screws fed to the right. The release cam 36 is so adjusted with relation to the mechanical movements that the spiral face 36 will make contact with the pin 31 at the proper time to release the stops 31 from their mutual engagement when the spring 33 will instantly depress the arm 28 and rockingthe conjoined arms18 and 27,

whereby the spline l7.will be thrown out of engage} 4 ment with .e lugs 23 of the wheel 9 and moved sufiiciently to the'left to engage, by its opposite end, the

lugs 24 of the gear wheell2, and throug h them'edium,

. of the train of gears 12 13, 14, will cause a reverse movement of the spindle, and the chuck beinginengage ment with the thread of the screw which it formed when turning, to the right will be automatically retracted from the work until the inclined face 35 of the cam 34 makes contztct with the inclined face 27 a of the arm 1 27. The latter will then be depressed and the arms 18 rocking in unison therewith will reciprocate the spline 17 releasing it from engagement with the gear12 and bringing it into operative engagement withthe gear 8, thus again reversing the movement otthe spindle.

This automatic alternate reversal of the spindle will be brought about-With a minimum amount of jar since the impact of the inclined faces of the cams will be graduated by their shape. The adjust-ability of the cams will be .found of great advantage allowing ofa varialion in the: travel er the spindle,

Having thus described my invention What -I claim,

1. A reverse mechanism including a spindle, a driving shaft having a plurality of loose gears mounted thereon, said gears being provided with a series of lugs, operative connections between said gears and the spindle, a sleeve adapted for longitudinal movement upon said shaft, a spline secured to said sleeve and adapted to engage said lugs, an operating lever'for said sleeve, means for operating said lever,.s. detent for the lever in one of its positions, and means attached to the spindle for releasing said detent.

2. A reverse mechanism including a spindle, -11 driving shaft having a plurality of loose gears mounted thereon, said gears being provided with a series oflaterally projecting lugs, operative connections between said gears and the spindle, a grooved sleeve adapted for longitudinal movement upon said shaft, a spline secured to said sleeve and' adapted to engage said lugs, a rocking lever for operating said sleeve, yielding means for rocking said lever, a ,yielding detent for the lever in one of its posltions, a cam disk carried by the spindle and adapted to releasesaid detent and means for automatically engaging said detent with the lever.

rocking the lever in the opposite dircctiomu detent for retaining said lever in one oi! its positions, a cam disk carried by the spindle and adapted to release said detent,

and means for-adjusting said cam disk longitudinally on the spindle.

4. A reverse mechanism including a spindle, a driving pawl secured to said sleeve and adapted to engage luternl teeth in said loose gears, a rocking lever for operating said sleeve, u disk mounted upon said spindle and adapted to engage said lever, a "spring for the lover, a detent for holding said lever against the'uction of its spring, a cum disk carried by the spindle and adapted to engage and releasesz id detont, a spring for the detent and means for adjusting said disks upon the spindle.

5. A reverse mechanism including -a spindle, adriving shaft carrying a plurality of loose genrs 'gezir connections between thesztid gears and the spindle, a grooved sleeve mounted upon the shaft and adapted for longitudinal movement, a pawl secured to said sleeve, :1 rockiug lever for operating the sleeve, a beveled disk curried by the spindle and adapted to engage an inclined face on said lever, a locking detent to hold said lover in one of its positions, and a disk having a com face carried by the spindle and adapted to release said detent from eugagc-.

ment with the lever.

6. A reverse mechanism including it spindle, :1 driving shaft carrying a plurality of loose gears. operative connections between the gears and the spindle, o. grooved sleeve mounted upon the shaft and adapted for longitudinal movement thereon, a pawl secured to said sleeve and adapted to engage teeth on said gears, a rocking lever for reciprocating the sleeve, a beveled disk mounted on the spindle and adapted to engage an inclined face on said lever, :1 detcnt for said lever, o. cum \VllOCl carried by the spindle and adapted to release said delent from engagement with the lever, and means for adjusting said disk and cam wheel longitudinally on said spindle.

In testimony whereof I alllx my signature in presence of two witnesses.

AMOS C. FI'TZ.

Witnesses WILLIAM O. 'lLoK, J12, H. W. GALLEY. 

